JP2000202611A - Closed type melting and casting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a melting and casting integrated apparatus, in which the present technical problem in a closed furnace is dissolved and the apparatus is not too large scale as the whole body and therefore, it can be installed while restraining the equipment cost and the operation can optionally be executed under atmosphere of pressurizing, vacuum or controlled state and the operating cost is low. SOLUTION: In an induction melting furnace composed of a furnace body 1, in which a refractory lining 12 is applied in a bottomed cylindrical vessel 11 withstood to a prescribed inner pressure and a coil 13 for induction heating is arranged, and a cover body 2 having a gas flowing passage for introducing atmosphere gas in the furnace, a mold having a structure connected with the upper space in the melting furnace and extended to a horizontal direction therefrom and withstood to the above pressure in the air-tight state, is fitted so as to be attachable/detachable to the furnace body, and an tilting device 6 for integrally tilting the melting furnace and the mold, are provided, and thus, the apparatus is constituted so that the molten metal 6 produced in the melting furnace can be poured from the upper space of the melting furnace into the mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closed type melting and casting apparatus. The apparatus of the present invention is suitable, for example, as an integrated smelting-casting apparatus operated under pressure in a nitrogen gas atmosphere for producing high-nitrogen steel.

[0002]

2. Description of the Related Art In the refining of various metals including special steels, the atmosphere is controlled by a specific gas, or the furnace is operated under pressure or vacuum, and casting is performed while maintaining the atmosphere to obtain an ingot. Conventionally, as equipment
As shown in FIG. 1 and FIG. 2, both a melting and refining furnace (1) for performing induction heating and a mold (2) for casting a molten metal (4) produced thereby are combined into one vessel (3). Enclosed closed furnaces have been used.

In this type of closed furnace, the vessel (3) is enormous, so if a sufficient pressure resistance is to be ensured,
Equipment costs increase. Since the volume of the space for gas replacement, exhaust, or pressurization is large, it takes time to achieve desired conditions, and the cost is not negligible.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to overcome the current state of the art in closed furnaces, so that the equipment as a whole does not become huge and can be installed with reduced equipment costs, It is an object of the present invention to provide an integrated apparatus for melting and casting, which can be optionally operated in a vacuum or a controlled atmosphere, saves operation time, and is inexpensive.

[0005]

As shown in FIG. 3 and FIG. 5 showing the internal structure of the closed type molten casting apparatus of the present invention, the closed type molten casting apparatus withstands a predetermined internal pressure. A furnace body (1) in which a refractory lining (12) is provided in a bottom cylindrical container (11) and a coil (2) for induction heating is provided; A lid (2), which can be hermetically sealed and has a gas flow path (not shown) for introducing atmospheric gas into the furnace, is connected to an induction melting furnace in an upper space of the melting furnace. And
A tilting device (6) for detachably attaching a mold (4) having a structure that is airtight and withstands the above-mentioned pressure, extending laterally from the furnace and detachably attached to the furnace main body, and integrally tilting the melting furnace and the mold.
The apparatus is configured to be able to transfer the molten metal (9) produced in the melting furnace from the upper space of the melting furnace into the mold.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A lid (2) of a melting furnace has a viewing window (31) and a temperature measurement / gauge port (3) as shown in FIG.
2) and a sampling chamber (33), and a head (3) having a valve (34) for opening and closing between the inside of the furnace and the sampling chamber may be provided. The valve (34) is used for disconnecting the sampling chamber (33) from the inside of the furnace, and connecting to the inside of the furnace with the skylight window closed to establish a common atmosphere. A leak valve (35) may be provided on the lid and the mold to facilitate release of the internal pressurization or vacuum.

The mold (4) can be divided into upper and lower parts,
After casting, it is convenient to divide the case so that the ingot can be taken out.

Any method can be used for connecting the melting furnace and the mold, but a structure as shown in FIG. 6 can be recommended. That is, a spout (7) for the molten metal is laterally protruded from the upper part of the furnace main body or the lid (the upper part of the furnace main body in the illustrated example), and the outside thereof is covered with the communication port (8) at the upper part of the mold. It has a structure in which the space between the spout and the communication port is sealed with a heat-resistant O-ring (81).

[0009]

According to the closed melting furnace of the present invention, unlike the conventional closed furnace, since there is no extra space to be sealed except inside the melting furnace and the mold, the entire apparatus can be constructed very compactly. Can be. This is advantageous, in particular, from the point of view of ensuring the pressure resistance of the device for smelting-casting under pressure. The space inside the building can be reduced. The construction costs of the device are thus reduced.

[0010] Needless to say, the operation can be arbitrarily selected under vacuum, under pressure, or under a specific gas atmosphere. Minimizing the space required for gas replacement, exhaust or pressurization requires not only the minimum capacity of auxiliary equipment for that purpose and the minimum cost of operation, but also It also means that the time required to reach the above condition can be reduced.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing the configuration of a conventional closed furnace, showing a stage during melting and refining.

FIG. 2 is a view showing a stage of casting of the closed furnace of FIG. 1;

FIG. 3 is a side view showing an external appearance of an example of the closed type melting casting apparatus of the present invention.

FIG. 4 is a longitudinal sectional view showing the inside of the apparatus of FIG. 3 during a stage of melting and refining.

FIG. 5 is a longitudinal sectional view showing a stage of casting, following FIG. 4;

FIG. 6 is an enlarged side view showing a configuration of a head portion in the apparatus of FIG.

7 is a longitudinal sectional view showing an example of a method of connecting a melting furnace and a mold in the apparatus shown in FIG.

[Description of Signs] 1 Melting and Refining Furnace (Furnace Body) 11 Vessel 12 Refractory Lining 13 Induction Coil 2 Lid 3 Head 31 Viewing Window 32 Temperature Measurement / Gage Port 33 Sampling Chamber 34 Valve 35 Leak Valve 4 Mold 5 Closed Vessel Reference Signs List 6 Tilting device 7 Molten metal spout 8 Contact hole 81 Heat-resistant O-ring 9 Molten metal

Claims (4)

[Claims] 1. A furnace body provided with a refractory lining and a coil for induction heating in a bottomed cylindrical pressure vessel capable of withstanding a predetermined internal pressure, and a furnace body capable of withstanding the pressure. An induction melting furnace, which can be hermetically sealed and has a lid having a gas flow path for introducing atmospheric gas into the furnace, is connected in the upper space of the melting furnace, and has an airtight structure extending laterally therefrom. A mold having a structure capable of withstanding the above pressure is detachably attached to the furnace main body, and a tilting device for tilting the melting furnace and the mold integrally is provided, and the molten metal produced in the melting furnace is removed from the upper space of the melting furnace into the mold. Closed-type melting and casting machine that can be transferred to 2. A sight glass, a temperature measurement port,
2. The closed type molten casting apparatus according to claim 1, further comprising a head having a gauge port and a sampling chamber, and having a valve for opening and closing the inside of the furnace and the sampling chamber. 3. The closed-type molten casting apparatus according to claim 1, wherein the mold is vertically splittable, and after casting, the case is split so that the ingot can be taken out. 4. A molten metal pouring port is provided to protrude laterally from an upper portion or a lid of the furnace body, and a communication port at an upper portion of the mold wraps the outside thereof, and a heat-resistant O port is provided between the pouring port and the communication port. 2. The closed type molten casting apparatus according to claim 1, wherein the apparatus is sealed by a ring.